在初中数学中,四边形是一个重要的研究对象,其中涵盖了丰富的知识.研究如图1所示的四边形
,
,
相交于点E,且
,我们将对该图形进行不同补充和改变,请你利用所学的知识来探讨以下问题:
,
,
,求
的长;
(2)如图3,若
,求四边形
的面积;
(3)如图4,若
,
,
,直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc1f76257275ab4b04f9bc913535670.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e673ef2d48215ca84a48377f17d6df00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b1f0690d47cac82c8d27e10c8444d57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(3)如图4,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc4f3da376bd01ef33579e6eecc6f047.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e673ef2d48215ca84a48377f17d6df00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
更新时间:2024-02-09 09:55:49
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解答题-问答题
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适中
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【推荐1】如图,在
中,AC=5,AB的垂直平分线DE分别交AB、AC于点E、D.
(1)若
的周长为8,求BC的长;
(2)若BC=4,求
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
(2)若BC=4,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://img.xkw.com/dksih/QBM/2020/12/4/2607031844331520/2608898144624640/STEM/f70ca427-077d-4f6a-bafd-8451f1c577ff.png)
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解答题-问答题
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适中
(0.65)
【推荐2】在平面直角坐标系中,点
,在
轴上任取一点
,连接
,作
的垂直平分线
,过点
作
轴的垂线
,
与
交于点
.设
点的坐标为
.
(Ⅰ)当
的坐标取
时,点
的坐标为________;
(Ⅱ)求
,
满足的关系式;
(Ⅲ)是否存在点
,使得
恰为等边三角形?若存在,求点
的坐标;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40630a669f4eedf626bc24851df10c85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0203b006524305c3d8ee0b6c34cd872b.png)
(Ⅰ)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/623afc24f2227004b0e1b3922dfb954b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(Ⅱ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(Ⅲ)是否存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05d8dc4b73d19e29de92e4e04cc2ee37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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【推荐1】如图,已知∠AOB=60°,点P在边OA上,OP=12,点M,N在边OB上,PM=PN,若MN=2,求OM的长.
![](https://img.xkw.com/dksih/QBM/2020/7/11/2503546735321088/2504204491104256/STEM/c18b79c3-5a33-4db3-9f3b-42d93a1dc2ef.png)
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解答题-作图题
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适中
(0.65)
【推荐2】如图,在
中,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/23/96f49f75-3fc2-4751-92f0-962b48cdd0ff.png?resizew=207)
(1)尺规作图:作
的高
,在
上取点P,连接
,以点P为圆心,
长为半径画弧,交
的延长线于点Q,连接
(不写作法,保留作图痕迹);
(2)在上述的条件下,求证:
为等边三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fffa3d9c32da53b0ea0c338012ea20c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/23/96f49f75-3fc2-4751-92f0-962b48cdd0ff.png?resizew=207)
(1)尺规作图:作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
(2)在上述的条件下,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e87b2f781cafa7989d81f9bf8c42b150.png)
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解答题-证明题
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适中
(0.65)
【推荐1】如图,已知
,直线
垂直平分
,与边
交于点
,连接
,过点
作
交
于点
,连接
.
;
(2)求证:四边形
是菱形,
(3)若
,
,则菱形
的面积是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f860fd4f992412e6c8d236bb44c9e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d4198db5536e2a6f313ff949651ac1d.png)
(2)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08bd65ebafd4d35cb7a162898550270d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5d30cd3e53a9df24fe6da5e8a3a7ec5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
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名校
【推荐2】如图,在四边形中,
,
,
,
,
,点
从点A出发,以
的速度向点
运动;点
从点
同时出发,以
的速度向点
运动.规定其中一个动点到达端点时,另一个动点也随之停止运动.设点
的运动时间为
;
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe83f1ae7e5f05d8bed6bf6f42db0e7d.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167bda06edd19e2be1fa65966b8cd070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0b870b1c8c593543e2e0059e3fca9e2.png)
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解答题-问答题
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(0.65)
名校
【推荐1】正方形ABCD中,E为AD的中点,以E为顶点作∠BEF=∠EBC,EF交CD于点F.
(1)求tan∠BEF;
(2)求DF:CF的值.
(1)求tan∠BEF;
(2)求DF:CF的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/13/0b015f59-9a95-4a3e-a313-82fde101849d.png?resizew=157)
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解答题-证明题
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适中
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【推荐2】已知:在正方形ABCD中,E为对角线BD上一点,过点E作
,交BC于点F,连接DF,G为DF的中点,连接EG,CG.
![](https://img.xkw.com/dksih/QBM/2022/5/27/2988440728346624/2989757163151360/STEM/061b56bd-2570-4460-98fb-09c06a4328c9.png?resizew=357)
(1)【猜想论证】
猜想线段EG与CG的数量关系,并加以证明.
(2)【拓展探究】
将图1中
绕B点逆时针旋转45°得到图2,取DF中点G,连接EG,CG.你在(1)中得到的结论还成立吗?写出你的猜想并加以证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c672f693a7e75a7bae4936dcb1920430.png)
![](https://img.xkw.com/dksih/QBM/2022/5/27/2988440728346624/2989757163151360/STEM/061b56bd-2570-4460-98fb-09c06a4328c9.png?resizew=357)
(1)【猜想论证】
猜想线段EG与CG的数量关系,并加以证明.
(2)【拓展探究】
将图1中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
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